This is a cup cap. It is made of plastic material, durable to use. Sturdy, anti-falling, vacuum, scald-proof, and stylish appearance, a perfect gift for your friend, family, co-worker, etc. Drinking through straw, convenient and simple. Features - Material: Plastic, silicone. - Size: About 8.40X6.00X3.60cm/3.30X2.36X1.41inch. - Removable and washable cup cover, clean and hygienic. - Safe second opening of the cover to prevent splashing, sealing and leakage, safe use for babies. - Creative and safe lid lock system helps you avoid spillage or leakage. Great for work, home and school. - Comes with one disposable drinking straw, which can be replaced with other straw. - These lids are also bite proof and perfect for transiting babies from bottles to cups.